Me too. One of the most interesting things sci-fi can do is examine the way different cultures/civilisations would develop - either in more discrete ways like a Japan-settled planet, or in mixed ways where various peoples have to create a new cultural norm due to the exigencies of colonisation. The Expanse did the latter really nicely with the Belters and their patois - their hard-scrabble interdependent existence makes the pluralistic multiculturalism of Earth void and necessitates a bottom-up melding in opposition to their 'oppressors' (Mars seems to go for a top-down militaristic superstructure instead).
I prefer this sort of stuff to the Utopian vision of a single Terran culture devoid of cultural differences (e.g. Star Trek, where the absence of religion, language, class, etc. seems to have created a United Humanity) - although it seems reasonable to suppose that race will gradually die out as a cultural phenomenon. To their credit, Trek did always maintain the cultural tension between Humans and other Federation aliens - starting with Spock, but best portrayed in DS9.